Log-turner.



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STM

2 Sheets-Shoot I.

(llo Model.)

No. 699,750. Patented Apr. 29, |902.

.1. J. SKINNEB.

Los TURNER.

(Application led Dec. 13, 1901.)

' 2 Sheets-Sheet 2.

(No Model.)

UNITED STATE-s PATENT FFICE.

J OHN J. SKINNER, OF PASO ROBLES, CALIFORNIA, ASSIGNOR OF ONE-HALF TO J.H. HENRY, OF SAN JOSE, CALIFORNIA.

LOG-TURNER.

SPECIFICATION forming part of Letters Patent No. 698,750,`v dated April29, 1902. Application led December 13.1901. Serial No. 85,828. (Nomodel.)

To all whom it may concern:

Be it known that I, JOHN J. SKINNER, a citizen of the United States,residiu g at Paso Robles, in the county of San Luis Obispo and State ofCalifornia, haveinvented certain new and useful Improvements inLog-Turners, of which the following is a specification.

My invention relates to those sawmill appliances commonly known aslog-turners, in which a mechanically-operated turning device is broughtagainst the log in order to change its position before it is againpresented to the saw.

One objectvof my invention is to enable theturning device to be broughtinto operative position and then put in motion by a single operatinglever, the latter controlling two sets of connections for thesepurposes.

Another object is to produce a simple and easily controlled gearing,preferably frictional, for positioning the turning device and fordriving it. j

A mechanical construction for accomplishing these objects and embodyingmy invention is illustrated in the accompanying drawings and is fullyhereinafter described.

In the drawings, Figure 1 is a side elevation. Fig. 2 is a longitudinalVsection on n: x of Fig. 3. Fig. 3 is a plan. Fig; l is` an endelevation of the chain-guide, one of Vthe bearings" for the tiltingframe being shown in crosssection. Fig. 5 is a detail view of thecontrolling-lever, showing its relation to the operating-rodand shaft towhich it is connected.l

In the horizontal framing A is mounted the tilting frame B, in which theoperating-chain C iscarried by the sprocket-wheels 1 2. D is the shaftfor driving-chain C and is j ou rnaled-V in boxes 3, Fig. 4, at themiddle of which is secured the sprocket l. The boxes 3 are long sleeves,ywhich extend up to the sprocket-hub 4. Bolted to the sides of frame Bare hollow trunnions E, which turn upon the sleeves 3 and enable theframe B toswing from the horizontal to the vertical effective positionof Fig. 1. The sprocket-chainC, which has a series of teeth 5 to actupon the log, travels in the frame and is held in a straight tautposition by a guide-grpove 6 on the face of the frame. The uppersprocket 2 is mounted in an adjustable box 7 in order that the chain canbe adjusted to the proper degree of tightness on the sprockets. F is anarm, suitably braced and secured to'framc B, from which a chain `Gextends to and is wound upon a druml 8 on a" shaft H. When frame B isdown, arm F projects toward the front, and when the pull comes uponchain-G the frame is raised to vertical position.

The'operation of the frame and the mot-ion of sprocket-chain C arecontrolled by different movements of a single'lever I throughconnections to frictional gearing, driven shafts, and aconstantly-running driving-shaft. J represents such a driving-shaft,carrying at vone'end a power-pulley 9 and-at the other a `friction-facedpulley K, preferably built up Sor surfaced with paper or other suitablematerial. In proximity to this vpulley K, one on each side, are thedriven pulleys LM, mounted on the shafts N H, the mounting and boxing ofwhich are of peculiar construction and 'are similar for each of saidpulleys. Boxes l2 13 are secured to the main frame, in which are sleevesl1 15, having crank-arms 16 17 and eccentric bores through whichrespectively pass the shafts N and H, upon which the driven pulleys aremounted.

The lever I, as shown in Figs. ..1 and 5, is connected at its lower endto a transverse rod 18, which through a bell-crank`19 and connecting-rod20 operate the crank-arm 16. The lever is also connected at a pointintermediate between itsupper and lower ends to a thimble on the end ofa rock-shaft 21, having bearings in the frame A and provided Twith acrank 2:2,` Fig. 2,-'frorn Which connecting-rod23 extends to crank 17.Thus two centers of oscillation are-provided for lever I, so that it canbe given two distinct movements. First, with shaft 21 as a center it canbe moved in either direction sidewise (looking at Fig. l) andwill'rock'said shaft 21. Rod 1S can be flexible enough to permit this.When shaft 2l is turned by moving the lever to the left, Fig. 1,v theeccentrically-set shaft of pulley M'will be moved toward thefrictionpulley and pulley lVLwill be driven, Winding the chain upon drum8 and raising the sprocket-frame to vertical position. A reversemovement of the lever will throw pulley M off the friction. Second,lever I is a ICC lever of the first class relatively to rod 18, and theconnection with shaft 2l, Fig. 5, is the fulcrum. Ilence by pushing thelever inwardly rod 18 and its described connections will be operated andpulley L will be brought into contact with the friction and will bedriven in the direction of the arrow, Fig. 2. On the outer end of shaftN is a sprocket 24, from which a chain 25 extends to a sprocket 26 onthe driving-shaft D of the log-turning chain. The latter thus receivesits effective movement in the direction of the arrow, Fig. l, so long asthe pulley L is in contact with the friction.

The logis presented sidewise to the front of the machine in any suitableWay. Before each operation the frame B is down to or toward itshorizontal position, as shown in dotted lines in Fig. 1. The operator atthelever I by pushing such lever to the left and inwardly will set bothfriction-pulleys in motion, causing the frame B to rise and putting thesprocket-chain C in motion, thus turning the log and at the same timeholding the frame B up to its work. To throw the machine out of gearand' stop it, he reverses the motion by pulling the lever I and turningit to the right, which releases both frictions. Thus by means of oneleverand without moving from his place he controls the whole operation.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is- Y 1. Alog-turning apparatus comprising a tilting frame, carrying a toothedchain, a constantly-rotating gear-pulley, a pair of pulleys in proximitythereto, connections from one of such pulleys to the tilting frame,connections from the other pulley to the toothed chain, a singleoperating-lever, andnde'pendent connections from said lever for causingsaid pulleys to engage with said gear-pulley.

2. A log-turning apparatus comprising a tilting frame, carrying atoothed chain, aconstantly-rotating pulley, a pair .of pulleys inproximity thereto, connections from one of said pulleys to the tiltingframe, connections from the other pulley tothe toothed chain, a singleoperating-lever, a rock-shaft, to which said lever is pivoted, connectedto one of said pair of pulleys, a rod, to'which said lever is pivoted,connected to the other of said pulleys, said lever acting as a crank toturn the rock-shaft, and as a lever fulcrumed to the rock-shaft foroperatingthe said rod.

In testimony whereof I have affixed my signature, in vpresence of twowitnesses, this 22d day of November, 190].

JOHN J. SKINNER.

- Witnesses:

PAUL PFISTER, A. PFISTER.

.. am mi

